.nav{
    overflow: hidden;
}
.sk{
    position: absolute;
    top: 40px;
    left:190px;
    border-left: 1px solid #c81523;
    padding:3px 0 0 14px;
}
.sk_list{
    float: left;
}
.sk_con{
    float:left;
}
.sk_list ul li{
    float: left;

}
.sk_list ul li a{
display: block;
line-height: 47px;
padding: 0 30px;
font-size: 16px;
font-weight: 700;
color: #000;
}
.sk_con ul li{
    float: left;
}
.sk_con ul li a{
    display: block;
    line-height: 49px;
    padding: 0 20px;
    font-size: 14px;
    
    }
.sk_con ul li:last-child a::after{
        content:"\e91e";
        font-family: 'icomoon';

    }
    .sk_bd ul li{
        overflow: hidden;
        float: left;
        margin-right: 13px;
        width: 290px;
        height: 460px;
        /* border:1px solid transparent;li原来就有一个边框 */
    }
    .sk_bd ul li:nth-child(4n){
        margin-right: 0;
    }
    .sk_bd ul li:hover{
        border:1px solid #c81523;
        
    }
